There was a kernel update the other day, and I haven't seen this problem since, so if this is an issue with the video in the last kernel before what I'm using now, then I'll be fine going forward. If anyone knows of some other problem that might have caused the flashing, I'd like to hear about it and how to deal with it if it happens again.
Thanks in advance for any advice.
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System: Kernel: 5.15.0-73-generic x86_64 bits: 64 compiler: N/A Desktop: Cinnamon 5.2.7
wm: muffin dm: LightDM Distro: Linux Mint 20.3 Una base: Ubuntu 20.04 focal
Machine: Type: Laptop System: Dell product: Inspiron 5575 v: 1.3.3 serial: <filter> Chassis:
type: 10 v: 1.3.3 serial: <filter>
Mobo: Dell model: 0M0Y6P v: X01 serial: <filter> UEFI: Dell v: 1.3.3 date: 10/31/2019
Battery: ID-1: BAT1 charge: 39.1 Wh condition: 39.1/42.0 Wh (93%) volts: 12.5/11.4
model: SDI 0x4D,0x38,0x35,0x34,0x00,0x00,0x00D8 serial: <filter> status: Full
Device-1: hidpp_battery_0 model: Logitech Wireless Keyboard serial: <filter>
charge: 50% (should be ignored) status: N/A
CPU: Topology: Quad Core model: AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx bits: 64
type: MT MCP arch: Zen L2 cache: 2048 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 31938
Speed: 1380 MHz min/max: 1600/2000 MHz Core speeds (MHz): 1: 1386 2: 1391 3: 1387
4: 1384 5: 3466 6: 3470 7: 1390 8: 1392
Graphics: Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] vendor: Dell
driver: amdgpu v: kernel bus ID: 04:00.0 chip ID: 1002:15dd
Display: x11 server: X.Org 1.20.13 driver: amdgpu,ati unloaded: fbdev,modesetting,vesa
resolution: 1920x1080~60Hz
OpenGL:
renderer: AMD Radeon Vega 8 Graphics (RAVEN DRM 3.42.0 5.15.0-73-generic LLVM 12.0.0)
v: 4.6 Mesa 21.2.6 direct render: Yes
Audio: Device-1: AMD Raven/Raven2/Fenghuang HDMI/DP Audio vendor: Dell driver: snd_hda_intel
v: kernel bus ID: 04:00.1 chip ID: 1002:15de
Device-2: AMD Family 17h HD Audio vendor: Dell driver: snd_hda_intel v: kernel
bus ID: 04:00.6 chip ID: 1022:15e3
Sound Server: ALSA v: k5.15.0-73-generic
Network: Device-1: Realtek RTL810xE PCI Express Fast Ethernet vendor: Dell driver: r8169
v: kernel port: 2000 bus ID: 02:00.0 chip ID: 10ec:8136
IF: enp2s0 state: down mac: <filter>
Device-2: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter vendor: Dell
driver: ath10k_pci v: kernel port: 2000 bus ID: 03:00.0 chip ID: 168c:0042
IF: wlp3s0 state: up mac: <filter>
Device-3: Qualcomm Atheros type: USB driver: btusb bus ID: 3-2.4:6 chip ID: 0cf3:e009
Drives: Local Storage: total: 2.27 TiB used: 319.58 GiB (13.7%)
ID-1: /dev/nvme0n1 vendor: Crucial model: CT500P1SSD8 size: 465.76 GiB speed: 31.6 Gb/s
lanes: 4 serial: <filter>
ID-2: /dev/sda vendor: Seagate model: ST1000LM035-1RK172 size: 931.51 GiB
speed: 6.0 Gb/s serial: <filter>
ID-3: /dev/sdb type: USB vendor: Seagate model: BUP Slim SL size: 931.51 GiB
serial: <filter>
Partition: ID-1: / size: 38.17 GiB used: 15.36 GiB (40.2%) fs: ext4 dev: /dev/nvme0n1p2
ID-2: /home size: 418.42 GiB used: 79.50 GiB (19.0%) fs: ext4 dev: /dev/nvme0n1p3
USB: Hub: 1-0:1 info: Full speed (or root) Hub ports: 4 rev: 2.0 chip ID: 1d6b:0002
Hub: 1-2:2 info: NEC HighSpeed Hub ports: 4 rev: 2.0 chip ID: 0409:005a
Hub: 1-2.1:4 info: NEC HighSpeed Hub ports: 4 rev: 2.0 chip ID: 0409:005a
Device-1: 1-2.1.1:5 info: Logitech Unifying Receiver type: Keyboard,Mouse
driver: logitech-djreceiver,usbhid rev: 2.0 chip ID: 046d:c534
Device-2: 1-2.1.4:6 info: MediaTek Integrated Webcam type: Mass Storage
driver: usb-storage rev: 2.0 chip ID: 0e8d:1887
Device-3: 1-4:3 info: Realtek Integrated Webcam type: Video driver: uvcvideo rev: 2.0
chip ID: 0bda:568a
Hub: 2-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.1 chip ID: 1d6b:0003
Hub: 3-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 chip ID: 1d6b:0002
Device-4: 3-1:2 info: Seagate RSS LLC Backup Plus Portable Drive type: Mass Storage
driver: uas rev: 2.1 chip ID: 0bc2:ab24
Hub: 3-2:3 info: Terminus Hub ports: 4 rev: 2.0 chip ID: 1a40:0101
Device-5: 3-2.1:4 info: Realtek RTS5129 Card Reader Controller type: <vendor specific>
driver: rtsx_usb,rtsx_usb_ms,rtsx_usb_sdmmc rev: 2.0 chip ID: 0bda:0129
Device-6: 3-2.2:5 info: USB 2.0 Hub type: Mouse,HID
driver: hid-generic,hid-multitouch,usbhid rev: 2.0 chip ID: 2a94:5249
Device-7: 3-2.4:6 info: Qualcomm Atheros type: Bluetooth driver: btusb rev: 2.0
chip ID: 0cf3:e009
Hub: 4-0:1 info: Full speed (or root) Hub ports: 1 rev: 3.1 chip ID: 1d6b:0003
Sensors: System Temperatures: cpu: N/A mobo: N/A gpu: amdgpu temp: 70 C
Fan Speeds (RPM): cpu: 0
Repos: No active apt repos in: /etc/apt/sources.list
No active apt repos in: /etc/apt/sources.list.d/google-earth-pro.list
Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
1: deb http: //packages.linuxmint.com una main upstream import backport #id:linuxmint_main
2: deb http: //archive.ubuntu.com/ubuntu focal main restricted universe multiverse
3: deb http: //archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
4: deb http: //archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
5: deb http: //security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
6: deb http: //archive.canonical.com/ubuntu/ focal partner
Info: Processes: 334 Uptime: 10h 57m Memory: 7.41 GiB used: 2.82 GiB (38.1%) Init: systemd
v: 245 runlevel: 5 Compilers: gcc: 9.4.0 alt: 9 Client: Unknown python3.8 client
inxi: 3.0.38
A little new information: This happened again last night, so it hasn't self-repaired. I usually minimize all running apps when I walk away from my computer, but last evening I left one window open. When I roused the system from screen-blanked state the flashing started and I left-clicked the mouse as usual. The flashing did not stop, and I noticed that the mouse pointer was inside the open window. When I moved the pointer outside the window and clicked again, the flashing stopped. So it seems that the pointer being inside the app window affects the situation.